YONGNUO YN600Air 5500K モデルを買ってみた

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YONGNUO YN600Air LED ビデオライト 5500K SMD LED搭載超薄カメラビデオカメラ用補助照明撮影用 Canon Nikon Olympus Pentax Panasonic などカメラに対応フラッシュディフューザー付き - YONGNUO — YONGNUO YN600Air LED ビデオライト 5500K SMD LED搭載超薄カメラビデオカメラ用補助照明撮影用 Canon Nikon Olympus Pentax Panasonic などカメラに対応フラッシュディフューザー付き cho45

YONGNUO

★ 4.0 / 5.0
cho45

4000lm とそこそこの明るさでそれほど高価ではないというやつ。YONGNUO 他のモデルだと BLE で制御できたりして便利なものもあるのだが、どう考えても技適なしなので Air という無線なしで軽量のモデルにした。

とりあえず ColorMunki Photo と Argryll CMS でスペックを測ってみた。フル発光させた状態。

 Result is XYZ: 1270.664026 1294.036709 1217.424578, D50 Lab: 256.337129 7.153578 -21.032620
 Ambient = 1294.0 Lux, CCT = 5347K (Delta E 1.232774)
 Suggested EV @ ISO100 for 1294.0 Lux incident light = 9.0
 Closest Planckian temperature = 5383K (Delta E 1.057104)
 Closest Daylight temperature  = 5504K (Delta E 4.621070)
 Color Rendering Index (Ra) = 95.5 [ R9 = 91.6 ]
  R1  = 95.8  R2  = 98.3  R3  = 90.0  R4  = 94.5  R5  = 97.9  R6  = 93.5  R7  = 97.7
  R8  = 95.9  R9  = 91.6  R10 = 92.7  R11 = 91.3  R12 = 70.5  R13 = 96.6  R14 = 94.0
 Television Lighting Consistency Index 2012 (Qa) = 96.5

スペック上の Ra は 95以上となっていて、測定結果は 95.5 とほぼ同じ。一方 R12 (青) の演色性はよくない。(備考：Ra は R1〜R8 までの平均値なので R9以降は Ra の評価に入らない)

Invalid

 Result is XYZ: 1219.403010 1232.370860 1185.134648, D50 Lab: 251.940561 10.004276 -24.236752
 Ambient = 1232.4 Lux, CCT = 5373K (Delta E 2.981570)
 Suggested EV @ ISO100 for 1232.4 Lux incident light = 8.9
 Closest Planckian temperature = 5462K (Delta E 2.553592)
 Closest Daylight temperature  = 5589K (Delta E 6.107197)
 Color Rendering Index (Ra) = 95.7 [ R9 = 88.7 ] (Invalid)
  R1  = 94.5  R2  = 98.2  R3  = 92.1  R4  = 95.5  R5  = 96.4  R6  = 93.8  R7  = 99.3
  R8  = 95.6  R9  = 88.7  R10 = 96.0  R11 = 92.2  R12 = 71.8  R13 = 94.9  R14 = 94.9
 Television Lighting Consistency Index 2012 (Qa) = 97.0 (Invalid)

少し時間が経過すると、発熱のせいかなにかで多少色が変わってこのように Invalid がつくことがある。

spotread の説明だと以下の通り

The -T option causes various color temperatures to be displayed, plus the Color Rendering Index. Three color temperatures will be shown. The first is the classic Correlated Color Temperature, which is the black body (Plankian) color closest to the measured color in the CIE 1960 UCS color space. The second is the black body (Plankian) color that has a minimum CIEDE2000 error to the measured color. The last is the daylight color that has a minimum CIEDE2000 error to the measured color. The delta E between the closest temperature and the measured color is also shown for each. The Color Rendering Index (CRI Ra) including the R9 value, plus the TLCI (Qa) is also computed if the instrument is capable of spectral measurement. If the notation (Invalid) is displayed after the CRI or TLCI, then this means that the the spectrum white point is to far from the black body and Daylight locus to be meaningful.

http://argyllcms.com/doc/spotread.html